A device which controls the voltage and current being delivered to a capacitor or battery.

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2answers
22 views

connecting a hp laptop charger adapter three wire output to a two wire cable [on hold]

My laptop charger adapter broke and I a have this other old adaptor in the house. They both have the same voltage(19V) and 1.58A. The first adapter(The one that broke) has three wires (black, white, ...
0
votes
0answers
23 views

USB DCP Controllers [on hold]

What are the possible USB DCP controllers available today? So far I found: MAX8895 TPS2511 & TSP2511-Q1 TPS2513 & TPS2513A-Q1 TPS2514 & TPS2514A Interested in creating a community ...
0
votes
2answers
40 views

3xAA Battery Pack how to wire?

I've mistakenly purchase an unwired battery pack, I'm unsure about how to wire this, never done anything like this but I thought if try and understand wiring a bit better. I have a 3xAA battery pack ...
0
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0answers
34 views

Hydrometer vs inverter and charge controller readings

I am using five 100 amp, lead acid batteries to run a dc portable cooler. It draws about 50 watts per hour. I have 150 watts of solar panel dedicated to this system. I live on the equator so I have 10 ...
1
vote
2answers
39 views

Charge a 6S Li-ion pack with a boost converter

Hi fellow makers and engineers, I'm trying to charge a 6S Li-ion battery pack (6 NCR18650B cells in series) using a rectified DC voltage of 16 Volts and boosting it to about 25.2V to charge the pack ...
0
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2answers
46 views

Li-ion battery maximum discharge current testing

I been playing a lot with Li-ion batteries (NCR18650Bs to be exact) and I have a question regarding how to test their maximum capabilities and generate my own conclusions. If you take a look at this ...
1
vote
1answer
44 views

Different voltage between the solar charge controller and the battery

I have a solar "box" project with a 10 W, 12 V panel and I noticed something when I was testing the battery voltage (two 12 V battery in parallel). When I measure the battery voltage directly from ...
-1
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0answers
26 views

MAX1555 without load sharing [duplicate]

Does MAX1555 supports charging lipo battery while load is connected ?
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0answers
19 views

What is the difference between iPad and iPhone charger? [migrated]

Both of them output similar voltages. iPhone 6 charger outputs 5v and iPad Air outputs 5.2v. The current on each charger is different - 2.1A for iPad and 1A for iPhone. What do those mean if the ...
-1
votes
1answer
51 views

DIY car phone charger

I am converting a wheelchair access vehicle into a campervan. Having removed the old wheelchair ramp lift mechanism, I'm left with a couple of 12V cables in the back. I'd like to turn one of these ...
0
votes
1answer
58 views

Should I connect solar panels in series or parallel for my charger?

I am making a solar charger for 3 AA batteries. I have two 6 volt 100mah solar panels. Will it be more beneficial to connect them in parallel to have more current or in series to increase the voltage? ...
3
votes
1answer
101 views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
2
votes
2answers
89 views

Charging time of lithium ion batteries

I am charging a 430mAh lithium polymer battery at 1C using BQ24232 charger IC (from Texas instruments). The charge terminates within 1 hour 20 min with battery voltage showing 4.17V. On research I ...
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votes
1answer
64 views

Building a USB Charging Circuit Using 120VAC

first time here. I've been working on developing a 3-port USB charging circuit coming out of a 120VAC wall outlet. Here is a basic schematic of what I'm following. I've been having some trouble ...
0
votes
1answer
37 views

Problem in circuit that charges tablet/cell phone via Micro-USB port

I am trying to design a circuit that can charge tablet/cell phone via micro-usb port. Attached is the circuit I put together. The basic idea is, take 6 ~ 12V DC from an AC-adapter, then step the ...
0
votes
1answer
66 views

DIY 18650 charge pack questions

I've tried searching through existing topics but haven't found an answer. I'm a beginner enthusiast. I have a couple of questions that I would appreciate input for. My plan is to make a battery ...
0
votes
4answers
76 views

Why is a cellphone charger rated like that?

Here is what I read on the nameplate of my phone charger: Output 5V DC 1A. So, I think the Max. Output power is 5 watts. Input: 100-240 AC 50/60Hz 200mA. I assume that the mains voltage is 100 ...
0
votes
1answer
50 views

LiPo charging circuit

I'm using a 6s Lithium Polymer battery in one of my projects, and I'd like to make it more consumer friendly. This means that I should probably get rid of the need for a balance charger (which few ...
0
votes
1answer
43 views

Multiple Wireless charging coils (Qi) in parallel?

I am making a device that will be wireleslly charged and I decided to go for a standardized Qi transmitter/receiver. The device is a kind of bulk and I want it to have an option to get charged no ...
0
votes
3answers
71 views

Looking an IC chip to charge cell phone [duplicate]

I have a DC voltage source (between 5 and 10V) from which I want to charge cell phone with a USB cable. I believe that using a LM317 or similar IC for charging cell phones is not a good idea as most ...
0
votes
2answers
72 views

Diode oring and charger

I am trying to setup a schottky diode oring circuit to switch between my battery and a dc power supply. I am dealing with some pretty high amperages and a liPo battery, so I need to make sure I get ...
-1
votes
2answers
49 views

Test car phone charger amperage [closed]

I have at car usb charger. It has 2 ports and is rated 2.1A when one port is used and 1A when both ports are used. I attached samsung tablet (N8000) witch requires 2A output. So, tablet isn't ...
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votes
1answer
155 views

Charging a 3.7 V with a 5V usb charger [closed]

For a project, I want to charge a lipo battery (3.7V @2000mah) with a 5V USB charger. I'm not into electronics, so I don't know if is viable to do that. So, can I charger a 3.7 battery with a 5V ...
-1
votes
1answer
68 views

How does this battery charger circuit work?

I am having a hard time figuring out how this circuit works. This is a portion of a circuit which uses AC mains (220 V) to charge a 9 V rechargeable battery. I have added the schematic and the ...
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votes
2answers
110 views

Calculate ampere using volt? [closed]

Can we calculate the output ampere of a battery charger by calculating battery voltage over time: 1. Get volt value name it volt1 2. Wait a second 3. Measure volt again name it volt2 So would the ...
1
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2answers
57 views

Is the efficiency of (Qi) wireless charging affected by a metal surface?

I recently picked up a Galaxy S7 Edge and love it. I've also gone "all in" on wireless charging, now owning three chargers: a third party standard charger, a third party QC 2.0 (15W) Adaptive Fast ...
1
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0answers
59 views

Transzorb for MCP73831 USB LiIon Charger?

The datasheet of MCP73831 (a small LiIon charger device) recommends a transzorb on the USB power input (VDD) for input over voltage protection. See Section 6.1.1.2. Absolute maximum ratings for VDD ...
0
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0answers
28 views

Zener diode in LT3652

I am designing a circuit for a battery charger using the LT3652 chip. The datasheet states that the BOOST pin - BOOST (Pin 11): Bootstrapped Supply Rail for Switch Drive. This pin facilitates ...
0
votes
1answer
34 views

Status pin of a charger IC

I am using the LT3652 charger chip,datasheet. Now, there is a status pin /CHRG. The pin is - CHRG (Pin 4): Open-Collector Charger Status Output; typically pulled up through a resistor to a reference ...
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votes
2answers
62 views

What are the dimensions of US outlet holes? [closed]

I am specifically referring to the standard NEMA 5-15 three hole outlet that is used in North America. What are the dimensions of the holes in the outlets? Surprisingly, I am having difficulty in ...
0
votes
1answer
46 views

How can I build a charger for this RC helicopter? [closed]

I have this remote controlled helicopter: http://www.clasohlson.com/se/Radiostyrd-helikopter/31-8071 Currently it is charged by connecting the remote control. However, since the RC runs on batteries, ...
0
votes
1answer
219 views

TP4056 Lithium Charger Module issue

Im having an issue with TP4056 Lithium Charger Module. Connected the battery 3.7v 150mah battery. When charging the red led is on but it never shuts off and no charge state is reached even after 1-2h ...
2
votes
2answers
107 views

On an Apple 12W USB Charger, how are the D+ and D- lines configured?

Looking for the voltages on the V+ and V- lines of an Apple 12W charger that corresponds to the 2.4A output.
0
votes
1answer
89 views

Can an old SMPS serve as a tablet/cellphone charger [closed]

A computer SMPS is capable of providing stable power supply to multiple devices like hard drive, CD/DVD drive, etc.... Is it possible to convert an old SMPS to power a tablet/cellphone? What ...
1
vote
1answer
54 views

High-voltage cutoff for battery charger necessary?

I'm trying to build a treadle-powered general purpose USB charger. Internally, the treadle spins a motor which feeds through a diode bridge to charge up a storage battery. The battery then discharges ...
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votes
3answers
176 views

Approval before using built portable charger on a smartphone

I've finally managed to set up a more efficient portable charger that uses 8 AA alkaline batteries(actually not so efficient). Schematic: simulate this circuit – Schematic created using ...
1
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0answers
91 views

Charge Li-Po battery with TP4056? (Or what else?)

I bought a single cell Li-Po battery and two different charger modules (one without protective circuit and one with protective circuit) from AliExpress. The Li-Po battery has a protection circuit ...
0
votes
2answers
101 views

What is the meaning of ripple voltage? and How to calculate a rectifier capacitor?

What is ripple voltage? I think it is the voltage difference of the two red arrows... Is that correct? My second question: If I need to use a voltage regulator LM7805CV. What would be the value ...
5
votes
3answers
2k views

Why some phones need a 5V charger although the battery needs 3.7V only?

I've many mobile (smart phone) chargers. The output of them is 5 volts but the battery needs 3.7v only. Why is it better to make a 5v charger then convert the 5v to 3.7v ? Why don't we just make a 3....
0
votes
1answer
82 views

USB to male bullet connector

I'm looking for simplest possible solution to power a load via USB to male bullet connector. Requirements: +5V input voltage 15V output voltage 1,5A output current on the bullet connector very low ...
0
votes
1answer
41 views

Wind power charge controller

I have one of these motors that i want to use as a wind turbine generator. http://www.ebay.com/itm/181392138415?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT I want my setup to be ...
0
votes
2answers
161 views

Onboard charging system for hybrid electric tractor

I’m in the process of converting a Cub Cadet SLT1554 from gas to a hybrid-electric tractor using a Motenergy ME0909 PMDC Motor. See description/specifications below: Motenergy ME9090 PMDC Motor 12-...
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votes
1answer
55 views

30-0-30 ACV 8A transformer to 12DCV [closed]

Good Day.. I have a 30ACV 8A transformer. I urgently want to make a 12DCV battery charger from it. What are the components that I should use? Please also help me out with its schematic. Your help ...
0
votes
2answers
104 views

Boost +12v from ATX PSU to ~13.5-14.5v [closed]

I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this. Out of necessity, I am going to fashion a car battery ...
-4
votes
1answer
73 views

What if i charge a battery with low ampere.? [closed]

Assuming we have a mobile battery and a charger which has less ampere than the original one. Is it damage the battery? if i charge with less ampere charger than the original one. i am asking for just ...
2
votes
1answer
218 views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
0
votes
1answer
82 views

LiPo Charging Ciruit - Switching Help

I do understand that similar questions and maybe even the same question has been asked before, I've found them but unfortunately as a result of inexperience on my part I have been unable to adapt the ...
0
votes
3answers
160 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...
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votes
2answers
83 views

What does battery charger's current rating mean? [duplicate]

I am basically a software engineer but have some interest in electronics so this is probably a very basic question. I understand theoretically a battery or power source can provide as much current as ...
0
votes
2answers
87 views

Bike mobile charger

Hi, I've made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn't charge any smart phones (with ...